Here's an answer that I agree with from askville.amazon.com:
First of all you might want to check your laptop power supply and verify that it is 110 only. A lot of the newer laptops are coming with power supplies that can run 100 - 240V. On the bottom of the power supply brick you should see all the related electrical info. There should be something that says something like :
Input 120
or
Input 100 - 240
If you've got one that ranges up to 240, then you're good to go. The only thing you'll need is a plug adapter for whatever country you're going to.
If it is only rated for between 100 and 120, then your best bet is a new power supply.
Most transformers are not designed for electronics, [my emphasis] so I wouldn't go that route.
I'd recommend a universal laptop power supply rather than one for your specific laptop. That way you will have an extra power supply in the future when you upgrade.
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Karen says: if you need to upgrade your power adapter, a good Universal choice is:
Lenmar LAC130U 130W Universal Laptop AC Power Supply with USB port - $55 on Amazon.com
http://www.amazon.com/Lenmar-LAC130U-Universal-Laptop-Supply/dp/B000VNMK7M/ref=cm_cr_pr_product_top
You'll also need plug adapters for the countries where you're going. Without knowing what they are, I can't tell you exactly which plug adapters to get (UK uses different plugs from France, etc.). I suggest you go up to Amazon.com and search on "plug adapter" in the Electronics section to find what you need.
As for that hair dryer...transform at your own risk. Every time I've tried using a transformer with a high-power-demanding appliance like a hair dryer, I've ended up blowing the transformer up. You might be better off finding yourself a cheap hair dryer at a shop in the country, instead of taking your own.
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Karen Mercedes - contralto
singwiththespirit [at] yahoo [dot] com
http://artfuljesus.0catch.com/karenmercedes.html
